Rivet analyses

title: BELLE_2013_I1230342

$\bar{B}^0_s\to\Lambda_c^+\bar\Lambda^0\pi^-$ Differential branching ratios

Experiment: BELLE (KEKB)

Inspire ID: 1230342

Status: VALIDATED NOHEPDATA

Authors: - Peter Richardson

References: - Phys.Lett.B 726 (2013) 206-210

Beams: * *

Beam energies: ANY

Run details: - Any process producing BS0, originially e+e- at Upsilon(5S)

Differential branching ratios for $\bar{B}^0_s\to\Lambda_c^+\bar\Lambda^0\pi^-$ with respect to the invariant masses of pairs of the decay products.

Source code:BELLE_2013_I1230342.cc

```c++ // -- C++ --

include "Rivet/Analysis.hh"

include "Rivet/Projections/DecayedParticles.hh"

include "Rivet/Projections/UnstableParticles.hh"

namespace Rivet {

/// @brief BbarS0 -> Lambda_c+ Lambdabar0 pi- class BELLE_2013_I1230342 : public Analysis { public:

/// Constructor
RIVET_DEFAULT_ANALYSIS_CTOR(BELLE_2013_I1230342);


/// @name Analysis methods
/// @{

/// Book histograms and initialise projections before the run
void init() {
  // Initialise and register projections
  UnstableParticles ufs = UnstableParticles(Cuts::abspid == 531);
  declare(ufs, "UFS");
  DecayedParticles BS0(ufs);
  BS0.addStable(3122);
  BS0.addStable(-3122);
  BS0.addStable(4122);
  BS0.addStable(-4122);
  declare(BS0, "BS0");
  // histos
  book(_c, "TMP/nB");
  for (unsigned int ix = 0; ix < 3; ++ix) book(_h[ix], 1, 1, 1 + ix);
}


/// Perform the per-event analysis
void analyze(const Event& event) {
  static const map<PdgId, unsigned int>& mode = {{4122, 1}, {-3122, 1}, {-211, 1}};
  static const map<PdgId, unsigned int>& modeCC = {{-4122, 1}, {3122, 1}, {211, 1}};
  DecayedParticles BS0 = apply<DecayedParticles>(event, "BS0");
  // loop over particles
  for (unsigned int ix = 0; ix < BS0.decaying().size(); ++ix) {
    _c->fill();
    int sign = 1;
    if (BS0.decaying()[ix].pid() < 0 && BS0.modeMatches(ix, 3, mode)) {
      sign = 1;
    }
    else if (BS0.decaying()[ix].pid() > 0 && BS0.modeMatches(ix, 3, modeCC)) {
      sign = -1;
    }
    else
      continue;
    const Particle& LamC = BS0.decayProducts()[ix].at(sign * 4122)[0];
    const Particle& LamBar = BS0.decayProducts()[ix].at(-sign * 3122)[0];
    const Particle& pim = BS0.decayProducts()[ix].at(-sign * 211)[0];
    _h[0]->fill((LamC.momentum() + LamBar.momentum()).mass());
    _h[1]->fill((LamC.momentum() + pim.momentum()).mass());
    _h[2]->fill((pim.momentum() + LamBar.momentum()).mass());
  }
}


/// Normalise histograms etc., after the run
void finalize() {
  for (unsigned int ix = 0; ix < 3; ++ix) scale(_h[ix], 1e4 / *_c);
}

/// @}


/// @name Histograms
/// @{
Histo1DPtr _h[3];
CounterPtr _c;
/// @}

};

RIVET_DECLARE_PLUGIN(BELLE_2013_I1230342);

} ```